std::experimental::observer_ptr<W>::observer_ptr - cppreference.com
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    std::experimental::observer_ptr<W>::observer_ptr

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    Library fundamentals v2
     
    std::experimental::observer_ptr
     
    constexpr observer_ptr() noexcept;
constexpr observer_ptr( nullptr_t ) noexcept;
    		(1) (library fundamentals TS v2) 
    constexpr explicit observer_ptr( element_type* p ) noexcept;
    		(2) (library fundamentals TS v2) 
    template< class W2 >
constexpr observer_ptr( observer_ptr<W2> other ) noexcept;
    		(3) (library fundamentals TS v2) 
    observer_ptr( const observer_ptr& other ) = default;
    		(4) (library fundamentals TS v2)
    (implicitly declared) 
    observer_ptr( observer_ptr&& other ) = default;
    		(5) (library fundamentals TS v2)
    (implicitly declared)
    1) Constructs an observer_ptr that has no corresponding watched object.
    2) Constructs an observer_ptr that watches p.
    3) Constructs an observer_ptr that watches other.get(). This overload participates in overload resolution only if W2* is convertible to element_type*.
    4,5) Implicitly declared copy and move constructors. Constructs an observer_ptr that watches other.get().

    Parameters